Dovetailing-machine



(No Modei.) 2 Sheets-Sheet 1.

J. SCHMIDT.

DOVETAILING MACHINE.

-No. 293,097. Patented Feb/5. 1884.

wlTNESs Efi." INVENTORVI "c/ (No Model.) 2 Sheets-Sheet 2.

J. SCHMIDT.

DOVETAILINQ MACHINE. No. 293,097. I Patented Feb. 5, 1884;

WITNESSES! l a INIVENTOR."

N. PETERS. PMlo-Lllhngraphor. Wuhhgiun, ml 1;

airman STAT ATENT Fries.

SPECIFICATION forming, part of Letters Patent No; 293,097, claficcl Application filed ScptembcrQS, liil. (Nomodeh) of whichthe following is a specification.

My invention relates to improvements in dovetailing and trimming machinesin which cutting devices and spurs for dovetailing operate in conjunction with saws for sizing and bits for trimming; and the objects of my invention are, first, to save labor; and, second, to do the work of dovetailiiig and trimming in a manner more neat and uniform than it has been done heretofore. I attain these objects by the mechanism illustrated in the accompanying drawings, in whioh Figure I represents a horizontal top view of my machine. Fig. II represents a vertical front view of my machine; Fig. III, a vertical side view of my machine.

Similarletters refer to similar parts throughout the several views.

The beams A A A and the standards B B B, secured in any suitable manner to the floor, constitute the frame-work of the machine.

G O is a frame attached by means of pins and screws to frame A in sucha manner that it can be changed in position on frame A.

Frame D is a carriage sliding in grooves (Z and (2 across frame A.

a c and a 0 are clamps to secure the wood to be worked upon carriage D, and to hold the same in position.

E is a circular saw fastened upon spindle f,

which is revolved by a belt upon pulley f.

F and F are bits secured to and revolving with shafts V and V, which shafts are moved by belts upon pulleys o and o. p

G and G are saws or cutting devices upon spindles gand g, with. their journal-bearings g and g, which spindles are revolved by belts upon pulleys i and i. Spindles g and g, with their j ournalibea-rings, have an upward and a downward movement in boxes \V W, of suit.- able material, preferably of cast-iron, and are secured to the arms .70 and 0 0, which arms are, at their lower ends, fastened to theshorter arm of levers y and y. The longer arms of levers y y are fastened to the treadle H. The

JOHN SCHMIDT, OF BURLINGTON, IOW'A.

DOVETAILINGG-MACHVINGE.

February 5, 1 884.

fulcru ms of levers y and y are made by fastening the levers at z z to the frame A.

K and K are spurs upon spindles L and L, and revolved by a belt upon pulleys Z and Z.

The mode of operation of my machine is as follows: WVhile the machine is in the position as indicated in Fig. I, I take a piece of wood to be trimmed and dovetailed, place the same upon the carriage D and under the clamps 00, where it is securely clamped;tl1enI slide the carriage forward until it reaches saw E, which saw cuts the piece of wood to the proper length. This being done, the carriage is moved on toward bits F and. F, which trim the ends of the wood to any desired shape, which is regulated by the shape of the bits. This being accomplished, the carriage is moved on toward cutting devices G and G, by means of which grooves for the dovetails are out. G and G can be set so as to cut grooves of any desired depth, width, and shape, depending on the construction and shape of the cutting device. The carriage is then moved toward the spurs K and K, by means of which the dovetail 7 grooves are completed, so as to give the groove the shape of a T, or any other desired shape, which is" regulated by the shape of the spurs. The cutting devices G and G, by means of treadle H and levers 1 and 1 can be raised and lowered at the will of the operator. WVhen pressure from the foot of the operator is brought to bear upon the treadle H, cutting devices G and G are raised and in position to cut the grooves. fWhen the foot is withdrawn, the treadle rises, and thereby the cutting devices G and G are lowered out of the reach of the wood, thereby enabling the operator to withdraw said cutting devices, from work at any desired stage, and enabling him also to follow up the work of the'cutting devices G and G by the work of the spurs K and K to the entire length of the out.

I am aware that boards have been trimmed and turned, and that they have been edged and grooved. This is not broadly claimed.

The gist of my invention consists in a specific arrangement of saws, burrs, and adjustable devices whereby a board is prepared for jointing.

WVhat I claim,

and desire to securcby Letters Patent, is I 1. I11 a machine for trimming and dovctail- I tally-moving frame D, carrying the stuff to be ing, the combination of the horizontally-moving carriage on which the stuff is placed with the cutting devices G and G, and means for lowering and raising the same,consisting'of the boxes W W, the forked arms 00 x, operated by levers y 3 and treadle H, substantially as set forth.

2. In combination with the horizontallymoving carriage D and the vertically-movable cutting devices G G, operated by spindles g g, the circular trimming-saw E, secured upon and rotated by spindle f, all as set forth.

3. In a machine as described, the verticallymovable cutting devices G G, operated by spindles g 9, combined with the horizontallymoving frame D, carrying the stuff, the trimming-saw E, and the bits F F, secured to and operated by the shafts V, substantially as set forth.

4. In amachinc as described, the horizoncut and trimmed, the vertically-movable cutting devices G G, for operating on each end or side of the stuff, and moved by spindles g g, and the spurs KK, fastened to and revolved by the vertical spindles L L, substantially as set forth.

5. In a machine for trimming and dovetailing, the combination of the frame D, horizontally moving over frame A and carrying the stuff to be cut, with the circular trimmingsaw E, the bits F F, for making one score, the Vertically-movable cutters G G, and the spurs K K, for following up the Work of said cutters the entire length of the cut, substantially as described.

JOHN SCHMIDT.

W'itnesses:

H. W. SCHRAMM, N. S. HAMMACK. 

